Use and Care Manual

Troubleshooting
2
ZURN WILKINS
1747 Commerce Way, Paso Robles, CA 93446 Phone:[phone] Fax:[phone]
Pipelinesinawatersupplysystemmustbeofsufcientcar-
rying capacity to maintain adequate pressure at the most remote
or highest xture. Under the maximum probable xture use,
minimum adequate pressure is generally 8 to 15 lbs. but may be
more, depending on the equipment being supplied. Relatively
high service pressures which can create high water velocities in
pipelineswouldallowuseofsmallerpipestosatisfyxtureuse.
However, high velocity tends to cause whistling and humming.
Reduction of pressure by the use of a pressure reducing valve,
in an attempt to eliminate such a condition, may reduce pipe line
capacities below that which is adequate for maximum probable
use. When high service pressures are in effect, either continu-
ously or periodically, the application of a pressure reducing valve
will be successful only when the installed pipe line is of adequate
size to satisfy the system demand at the lower pressure. When
actual water demands are unknown, the valve size should be no
less then the existing pipe size.
IS600XL (REV. E 12/19)
SOLUTION a. It may be necessary to increase pipe sizes only in some sections of the system leading to the
   offendingappliancesorxtures.Increasingthehouseservicemainsmightbenecessaryifsmall
   supplyisgeneralatallxtures.
b. Raise pressure gradually by readjusting valve until this point is determined.
c. Clean screen.
4. Valve appears to be noisy; hums, whistles or
chatters.
A. Hum or whistle is usually caused by a high velocity
 ofowinpipelinescausingvibration.
B. Chatter usually originates with worn seat washer or
loosely installed seal ring.
SOLUTION a. Pipelines could be small or too light. Reducing valves could be too small. Pipes and valves being
small would accentuate this condition.
b. Inspect seal ring. If a deep channel appears on seal ring face, replace or use the opposite side.
c. Frequently noise appears in a faucet or appliance and seems to originate from the reducing valve.
There is a general tendency to use streamline piping of a relatively small size. Velocity is naturally
high and noise of fast moving water is not unusual.
2. Pressureandxtureowisunsteady. A. Low water supply pressure in mains caused possibly
by high area demand during certain periods of the day.
B. Heavy periodic demands by appliances in the house.
SOLUTION a. This is a water department problem. It is due to the mains being inadequate for the demands
made on them.
b. House service lines may at times be inadequate for the load. Size of some pipelines may need to
be increased. Pressure setting of reducing valve may be too low.
c. Try increasing pressure before changing pipelines.
3. Small,inadequateowfromxtures. A. Pipelinestoxturesmaybetoosmallorhousemain
 supplymaybeinadequatefornormalxturedemand.
B. Heavy periodic demands by appliances in the house.
C. Screen clogged with debris.
PROBLEM
1. Pressure creeps or builds up in system above
the setting of pressure reducing valve.
POSSIBLE CAUSE OR CAUSES
A. Thermal expansion of water as it is being heated.
B. Foreign matter on seating face of seal ring.
C. Cut, worn or chipped seal ring.
D. Cut or worn stem o-ring or worn o-ring groove.
SOLUTION a. This is a natural consequence. It may happen each time that the heater runs. A pressure relief
valve or expansion tank must be installed. This will not prevent pressure rise but should limit it to
a safe level.
 b. Flushthereducingvalvebyopeningoneortwoxtureoutletswide.Ifthisdoesnotcorrectthe
problem, remove seal ring for cleaning.
c. Replace with new seal ring. Temporary repairs may be made by turning the seal ring over.
d. Replace with new stem o-ring and/or cartridge.
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